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Ultralow-nitrogen ultralow-boron molten steel refining agent and preparing method

A refining agent and ultra-low boron technology, applied in the field of molten steel refining agents, can solve problems such as complex action mechanism, achieve the effects of preventing high P waste, easy storage and transportation, and uniform composition

Pending Publication Date: 2019-04-05
西峡县耀辉冶金材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the solubility of boron in steel is extremely low, the mechanism of action is very complicated

Method used

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Embodiment Construction

[0026] The specific implementation manners of the present invention will be described in detail below. An ultra-low nitrogen and ultra-low boron molten steel refining agent, the refining agent is composed of component C and component D, the component C is low boron active lime, the dosage is 30-50% by mass, the component The composition and dosage of D are industrial aluminum ash, bauxite or calcium slag single or any combination, the dosage is 50-70% by mass, N≤0.02%, B≤0.015%, and the refining agent is alkalinity R: 3.0-5.0 (CaO / SiO 2 ), the refining agent is made by pre-melting vacuum refining process, and the indicators of each part of the final product are grouped as follows:

[0027] project

SiO 2 %

CaO%

al 2 o 3 %

N%

B%

P%

S%

index

≤10

35-50

25-35

≤0.020

≤0.001

≤0.08

≤0.1

[0028] The preparation method of the ultra-low nitrogen and ultra-low boron molten steel refining agent has the following pro...

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PUM

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Abstract

The invention discloses an ultralow-nitrogen ultralow-boron molten steel refining agent and a preparing method. The refining agent is composed of a component C and a component D, the component C is low-boron active lime, the component D is single one or any combination of industrial aluminum ash, bauxite or calcium slag, the refining agent is alkalinityR:3.0-5.0(CaO / SiO2), N is smaller than or equal to 0.02%, and B is smaller than or equal to 0.001%. The advanced premelting vacuum refining process is adopted in the molten steel refining agent, the component is uniform, checking is convenient,and mechanical and manual charging is facilitated. The refining agent is free of dust, use is safe and environment-friendly, the content of harmful elements N and B is extremely low, storage and transportation are facilitated, at the high temperature, during use, the agent is not prone to oxidation by air, the yield is high, deoxidization efficiency in the slag is high, the speed is high, and therefining agent is the most ideal high-cleanliness molten steel refining agent.

Description

technical field [0001] The invention belongs to the technical field of molten steel refining agents, and in particular relates to an ultra-low nitrogen and ultra-low boron molten steel refining agent and a preparation method thereof. Background technique [0002] High-strength steel with low welding crack sensitivity has been widely used in engineering machinery, bridges, construction, petroleum, chemical industry and other fields due to its excellent strength, toughness and welding performance. With the development of various engineering structures toward large-scale, lightweight, and high-parameterization, the demand for high-strength steel plates is gradually increasing. is constantly improving. Boron is one of the elements that can significantly improve the hardenability of steel. Since boron is easy to segregate at the austenite grain boundary, it inhibits the nucleation of pro-eutectoid ferrite at the austenite grain boundary and promotes the formation of bainite or m...

Claims

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Application Information

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IPC IPC(8): C21C7/06C21C7/064
CPCC21C7/06C21C7/064
Inventor 王庆社余振西刘显李欣
Owner 西峡县耀辉冶金材料有限公司
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